Update README
Squashed 'ffi-mini/' changes from 4c9f534..3cee33a

3cee33a libffi v3.0.14-rc0-WIP2: zwaldowski/libffi-iOS@6368781
775f4d6 libffi v3.0.14-rc0-WIP: zwaldowski/libffi-iOS@1020c1d
1fd81b7 libffi v3.0.14-rc0-WIP: zwaldowski/libffi-iOS@6b1ecfb
REVERT: 4c9f534 libffiv3.0.14-rc0-WIP: zwaldowski/libffi-iOS@1020c1d
REVERT: e4731ef libffiv3.0.14-rc0-WIP: zwaldowski/libffi-iOS@6b1ecfb

git-subtree-dir: ffi-mini
git-subtree-split: 3cee33a96caee71ee4ef846a75c12a6cd91fa60f
Merge commit '54e1ea772187cf35cb16b309da6e52b0162cfb1e' into next